gistfile1.rb

# Original from Mitchell

  def self.first_uninteresting
    all_numbers = Number.find(:all).map { |entry| entry.number }.sort
    last = 0
    all_numbers.each do |number|
      if number != last + 1
        return last + 1
      end
      last = number
    end
    return last + 1
  end


# ben_h

  def self.first_uninteresting
    existing = all(:order => :number).map(&:number).unshift(0)
    gaps = (1..(existing.last + 1)).to_a - existing
    gaps.first
  end